Unidentified woman 'may have had surgery on her left ankle'

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This composite sketch provided by the Suffolk County Police Department shows an unidentified victim whose partial remains were discovered off Ocean Parkway in Nassau County in April 2011. Other remains of the same person were discovered in April 1996.

When contacted by The New York Times, a spokeswoman for the Suffolk County Police Department would not comment on how the unidentified woman had been killed.

Investigators believe a possible serial killer is responsible for 10 of the bodies. The remains of an 11th victim — a 24-year-old woman named Shannan Gilbert — were found in late December. But authorities say Gilbert accidentally drowned.

Suffolk County police are asking anyone with information about the woman's identity to contact them or call Crime Stoppers at 1-800-220-TIPS.